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巨分解方程组,180*3/(x+5)+120*2/(y+5)=84,180*2/(x+5)+120*3/(y+5)=81
题目详情
巨分解方程组,
180*3/(x+5)+120*2/(y+5)=84,180*2/(x+5)+120*3/(y+5)=81
180*3/(x+5)+120*2/(y+5)=84,180*2/(x+5)+120*3/(y+5)=81
▼优质解答
答案和解析
180*3/(x+5)+120*2/(y+5)=84①
180*2/(x+5)+120*3/(y+5)=81②
①×3-②×2得180*9/(x+5)-180*4/(x+5)=252-162则180*5/(x+5)=90则x=5
②×3-①×2得120*9/(y+5)-120*4/(y+5)=243-168则120*5/(y+5)=75则y=3
180*2/(x+5)+120*3/(y+5)=81②
①×3-②×2得180*9/(x+5)-180*4/(x+5)=252-162则180*5/(x+5)=90则x=5
②×3-①×2得120*9/(y+5)-120*4/(y+5)=243-168则120*5/(y+5)=75则y=3
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